An empirical formula was developed for estimating coherent scattering cross sections of gamma-rays of energies below 1.5 MeV and in the range of 0 - 2.5mc units of momentum transfer.The formula has been compared with the experimental data available in the Topic: Gamma rays--Scattering.
A test program was conducted to isolate and evaluate the individual noise sources of a light helicopter. To accomplish this, the helicopter was mounted on a special test rig, at a 6-foot skid height, in a simulated hover. The test rig contained by dynamometer for absorbing engine power and an exhaust silencing system for reducing engine noise. This test set-up allowed the various components of the helicopter to be run and listened to individually or in any combination. The sound pressure level... Topics: LIGHT SCATTERING, POLARIZATION (WAVES), SEA WATER, MATRICES (MATHEMATICS), SCATTERING COEFFICIENTS
byDuvall, T. L., Jr.; Tarbell, T. D.; Title, A. M.; Wolfson, C. J.; Milford, P. N; Kosovichev, A. G.; Scherrer, P. H.; Bogart, R. S.; Bush, R. I.; DeForest, C.; Hoeksema, J. T.; Schou, J.; Saba, J. L. R.
In time-distance helioseismology, the travel time of acoustic waves is measured between various points on the solar surface. To some approximation, the waves can be considered to follow ray paths that depend only on a mean solar model, with the curvature of the ray paths being caused by the increasing sound speed with depth below the surface. The travel time is effected by various inhomogeneities along the ray path, including flows, temperature inhomogeneities, and magnetic fields. By measuring... Topics: LIGHT SCATTERING, LASER BEAMS, MIE SCATTERING, COEFFICIENTS, SHAPES
This paper presents an artificial intelligence monitoring system developed by the NASA Glenn Principal Investigator Microgravity Services project to help the principal investigator teams identify the primary vibratory disturbance sources that are active, at any moment in time, on-board the International Space Station, which might impact the microgravity environment their experiments are exposed to. From the Principal Investigator Microgravity Services' web site, the principal investigator teams... Topics: ELECTRON SCATTERING, SCATTERING FUNCTIONS, HYDROGEN, SCATTERING CROSS SECTIONS, MATRICES...